19660090 has 8 divisors (see below), whose sum is σ = 35388180. Its totient is φ = 7864032.

The previous prime is 19660063. The next prime is 19660097. The reversal of 19660090 is 9006691.

It can be written as a sum of positive squares in 2 ways, for example, as 18584721 + 1075369 = 4311^2 + 1037^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (19660097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 982995 + ... + 983014.

Almost surely, 2^19660090 is an apocalyptic number.

19660090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19660090 is a deficient number, since it is larger than the sum of its proper divisors (15728090).

19660090 is a wasteful number, since it uses less digits than its factorization.

19660090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966016.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 19660090 is about 4433.9700044091. The cubic root of 19660090 is about 269.8952039578.

The spelling of 19660090 in words is "nineteen million, six hundred sixty thousand, ninety".